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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1831d7372eee184e0fc780c22b9f5ca5699c799151a86ca0febb650b5c4d07d' 
  AND token = '3F8TcbRx4keyBrXIUi6AAgU2Yrv6Lf4d27/r9Lu8WgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}